Edding 8200 Joint Marker. Tile joint pen. Grout Marker Colors to Choose From | eBay
edding 0.5 Mini Permanent Marker Pack of 4
Amazon.com: edding 4500 textile marker - black - 1 pen - round nib 2-3 mm - permanent fabric markers for drawing on textiles, wash-resistant up to 60 °C - marker pens for fabric lettering